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Standard Refrigeration has a service manual PDF that you can download which has a cleaning procedure for shell and tube condensers. http://www.stanref.com/pdfs/Service.pdf
Generally, brushing the tubes will do the job most of the time. Water quality should also be checked.

Just a suggestion. I would leave water treatment to a water treatment company. Customer might be a wee upset if you corrode there tubes especially on a big chiller. Or learn it well 1st from someone who knows how to treat water.

Originally posted by referjunkie Just a suggestion. I would leave water treatment to a water treatment company. Customer might be a wee upset if you corrode there coils especially on a big chiller. Or learn it well 1st from someone who knows how to treat water.